As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LANDING GEAR WOULD NOT EXTEND WITH GEAR HANDLE DOWN. GEAR WAS LOWERED USING THE MANUAL EMERGENCY EXTENSION AND THE GEAR DOORS WERE CLOSED USING THE PNEUMATIC GEAR BOTTLE. PROBABLE CAUSE WAS THE HIGH RESISTANCE IN THIS SWITCH AND THE GEAR DOOR CLOSED SWITCH. (K) (EA21200504860)